Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2916d1cb02346f2…

MALICIOUS

PDF

85.6 KB Created: 2021-06-10 21:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fa43c69e6f7c43c46a0e6c48ab8abce6 SHA-1: 3bce2e8a7e45ecd102d2b827936a63b4e859742f SHA-256: f2916d1cb02346f28d3fdafd48b6327db2813985c9502bdefcdb96780c067f37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=wwe+svr+2007+ppsspp+download PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j580n9mdrete3r5oks4kqm6tp1/luwoxinefovapobe.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/8pvu02i4lh8q4oiufnjc7drh3a/xivaxewovawoxafomipanij.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/a8f418a425056daf95eb7079104d63e9/16494083259.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ba76cd0f4051489ae35d54b254096f16/vusumagenizipa.pdfIn PDF document text
    • http://shosholoza.de/file/biluxizogadonatixavu.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/e1rv77j8be4nimsp6mc253l81d/85551260881.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a3629211e1d4dc0e070f72ff83107d14/bibutogetukexapozotor.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ced9f06c7f---29720652341.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/kajovizonerurikedikitawof.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/nukebapumupunipegaku.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/sexutugetetotunumifuwi.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a413ea1a96d---68046475481.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/260034506.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/sn055nmoe2r6droh7sp6pev6ou/lisekelatopo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 5472 bytes
SHA-256: 371407751ce894f5eaf40719d10818b9cb1acb284ce269cd0469a622e2e4cab4
font_01_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 3056 bytes
SHA-256: 2cea9012859b94a93b3904c381447c9f1829c04946614b38d9a5154add7181a3
font_02_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 10872 bytes
SHA-256: 1bed1b6561580e0164d3f73c21a29260bc1c1fb84176edb7597df86c1d504255
font_03_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 16544 bytes
SHA-256: 4354bd37e85197a997b2f6c8c8698034d2711068b41d1b66819094364c364bcc
font_04_sfnt_off000138a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A7 3720 bytes
SHA-256: be49da2b13e2037411ef1e34285f38484bdd333f05ce7a3f0c02aeca0bc5d16d

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